Modify packer jobs

- Remove builder ARM node
  - Projects only need docker ARM node
- Add Ubuntu18.04 Helm node

Issue-ID: CIMAN-33
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
Change-Id: I4ca9ae005bf1067bedd44c3830a07db6bc95030a
1 file changed